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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbc93f0ce7a71f9c0b05737aac9519fde6f330b8757cb2b9ff7c61ccdff27ab' 
  AND token = 'bRUG0nmXh72BzFTUOKcTsXwKCtgwQOD8GJtZe8+D13g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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