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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb6feeb11f492dad7dc7ce24986f3deab260fe58cf959fba611aaebfe633ba5' 
  AND token = 'LMZmKr4SP+9gylcU6QRUbUxQ1MUc6bKZIL0Nqy77/oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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