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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc6da626c73672b8e828974b93e071dc5f257b22ddeb0a384de50f62b23c347' 
  AND token = 'HQMfFOw5TjgHJdHGT9TdLicJU9pTG+4yLIUXpGaot1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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