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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199df90c188df83e97b8e3e26988553c01f493c8139573610af24c4881ee6d72' 
  AND token = 'SrKF6xntyP1A+O69dSk96ica9wOQCYuPNmQhMUdccHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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