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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccc08aee95ed9e96bac3915da907942f75fdb2bbe06c4c3258e5779e58ca1e6' 
  AND token = '5JSQZURvIaX5cMy2qnVVbY1jZUX/kX6Uox5eyWnNdH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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