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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7a4ef73473225b3107b3aabbe7371b1024b69d432dbefd8c7415954c5ac935' 
  AND token = 'WvV1LkuPmLeIVDPj3FNrh+tHMUfMrX5xAD6KyZhFOP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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