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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e07c3e45fe172da013dc590a2264127cf778a20b8bfbe3e3608477c6242f58' 
  AND token = 'v7Nh4V0BfOCVBoSXQR43SVIdJpajDJLK7jL48IzY1KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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