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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9264a30e91b64f87d699a3a9690d314adf5fedb6c1658902d6edc8016ccb1f' 
  AND token = 'KJ+rgX8RggSCPxO0nEbUPk7+Paa3mm7Jx4B7e8SOZ6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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