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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ada52b8c344eee856ccc12d2455dda778d68fdd89fcf9163128c8bf1a9ff73f' 
  AND token = 'MPjjJ6L8fP5yo95IOy00zCA4gOXS3DWF9CZKXOCgriY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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