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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4014fd58dd64fcfe843e1cc83929fd509e4e094f8891e50f3fea94ef1072f779' 
  AND token = 'JimYyas/VNkO3IEfea6gz8xrAcvIKgswn8+fykdwIQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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