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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59c092c415ca8b46078d966dfb6a5497334bd2736a1b4c2bad69592e46806f1' 
  AND token = '61dCNVbsw5JMMEfj/j0cK6GjaPv+24WmKThZWIs4ft4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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