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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e6977bde25bc1f4ff63834732e27e4897b6c4219a98c0d48bdc31c10712b0c' 
  AND token = '6AWEej9t28ZCuKx/sx/MyNm3BZGxMIF5XiXQwJdkh2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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