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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d7819042f8da3759f5f210b62903826de71946aa6acec97b53815ab19095c3' 
  AND token = 'E5C0mwk9MCNuOvGNNsOvbF/utdaWSxzzIHVAYWGcnVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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