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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393f226113f9b7df7e0646949d077f6920e57e459e1912cf6f3abc4a4a992660' 
  AND token = '6mFL7J9LjzTgDKWzCTYkRTdg8JeyY2fOrAgZ4kGuAQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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