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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec270c4df77e98f6310388aa0e850b686c5e552af0ea34257c3bcfb52f3be291' 
  AND token = 'KsQH5ehL/hyM2jeOyvdi3PHdRiz4rJ25V3P6YB1egmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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