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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1296ddad782003d00e09c6b56afb76a89ffab43bd45c84896526b998ebe388' 
  AND token = 'iNn92IccZOsM308dA9BGHcmXJ2iTc9pyl5bE7K16Ids=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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