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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d14741260819f17b2f5c557700112c78cf24d32e20c6813d1c257f12903c1d' 
  AND token = 'AjjOKb8HAqKeybuOOXiLq9FKDLWjfKtjYgU5KOPy2UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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