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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cae0df0180b984d74d8498716026c97bb2b0c71ea37aa123c9068484ca1d3f' 
  AND token = 'qvJciM66MSNgEBbFd+CH63U865xKDqQGtZa51ocy7XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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