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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e0edb83ae81aed789db8f67ac9eba3a32311d125710a9f2370015a76139ac2' 
  AND token = 'ihCZoznDrN+sNXnhisHjBVasgy122ufIt7bc/ZRLFAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}