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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3321c1ce3df23cb15f7bdc824a7d14a62ccacb57cb5c68e9f64e4e577ba16fdd' 
  AND token = 'TgkvT8C1Toio6rJpk+f3HN92zAY7MURRJbDhPr3gzJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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