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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11ffb196e61e1f6fc4ccb27be786d8d74946e32277b76b0cbdc3e405bac93db' 
  AND token = 'T67VfBLLkWBa9LDjt2+CRPnGmrqylvsNOEa2jfF7JPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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