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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1675816093cc5e555a97ea94b7e2f609f7a0130fbbc4a5cd7087606fbc83837' 
  AND token = 'dTsvNlM7nd5X8f6A+X4hm3Eh+8X9dJU5p6VD/YyrBJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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