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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4486d7c0a168e45c3b8b890e22aaef4117361e99172d9253bf8897bab501c69b' 
  AND token = 'W518LsRbuyNSIRjKGgt/VSI9+bS1q9NfrAHg5+pby6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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