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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d44b455cf735b17d9a2f959015f855646590877b5ab8d9c0aabf1eaeb4e0b98' 
  AND token = 'J2tSp63deJ7MVJTT0QzHC/ctDaKvRhRkfkppuFngUBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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