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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f9dae268321b7d617546a4acf47d7cd6328022777175f88ae586ac9ee7e5d7' 
  AND token = '1GcgatHYgAMB+7rMmCOfnCUJSZc/0RkXm4E1joOe4yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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