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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc29c41b11e4e16685494e3196dd0323efc510b72b411dc7901b708dec41b79f' 
  AND token = 'tpS3iYPQSxQRY8gDs4YbnC0XwNtLWRb3aSSnEHTy+tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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