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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73264ea2e124584afd6795d416f1a8b2bfa81055b3cc74bacb5a1abc599b93ca' 
  AND token = 'mvh+4s/QibM9cD0NJukMmNjMG+23Q3CoKK9c85vP6ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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