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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa620e97710223d9b9f768ea9f67927e54f57217381d28053ae839f89a9b6c9b' 
  AND token = 'nsEQZgszgFh+shZeQ+3/ZQERLX65R2jTgmOCkAFPmW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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