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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebf48e18dfcf4888870492f1ddf2cbee28e3500faccc87d963f956fc9b79f90' 
  AND token = '1y/tpKw/+ArBbwz2//4mlv486Ryw1DwMJdlMI0x5kxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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