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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a81975c2a93f6e5ae226c3c02105239299d498910cef7a9c2ce81b891b9b49' 
  AND token = 'KdtC3pGjMVpV2m5YkVuMQV1fWDz4PLp+Ao3S+vC1sf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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