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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da04c7a01e0785d1b4facdd4ccd28783da9d79e128043cc2aae3cfcd83f5bc3' 
  AND token = 'Aea3UTJpmu4jpiJNBdCSTDKh9zbxhNqQ5BFKBIf2bPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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