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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908fc6d5d7638a18323e6669291a371338404235bad50ff63959626b809b40dd' 
  AND token = 'N60KB9M6UaEXLN01EtEmJu6chOVbm7hEB4XiUHJbPEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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