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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90e0cf6c4a2aabfcc0b89800ab219153f981dfd8a0c92ba72b6eadf56eee9a2' 
  AND token = '6mVmPUZkRzAh3T5GWVX3pnGEMDvitVq3MIht8fIQySU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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