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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d5957ed60a7d0dd2aba915d928f64249c618ef583628bcf877fa49e15fcb29' 
  AND token = 'ZY3PHYrrKpJHuPnIvo1uQ+dlFHTJnvxOt0GQ84Qfddk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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