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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d856c341b94805eb4ad52638136fa72103156595409218e6537b02ba543449e' 
  AND token = '+uATph8DgDu/w2sXG/3sJ3h62VOkotCC0sN7B8ueNf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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