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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2793ae1ae998ab2b88188a7857ce10a536f8d19905670370f5a54f8a0916b94' 
  AND token = 'jv8+yWIBUtB1a2cv1gzYHN9ZTiSVdpGb3j0UBaNh+Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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