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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87de4cc1dd96d95bced097d8523690e7e98b82da8f444d4e29cf1d4f0bb318a0' 
  AND token = 'NEsNUAUhLpZyLI6ZnSh54AA531jWm7s6k6N305BAm0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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