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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4dcaca7366fe44e4aa127abe48c2e0536b4e7d198014a3f4c87b2db3cc19cef' 
  AND token = '7KtEpB8xZnc0ZC0Q1bAsnH7t/oKU8S4EGH4z7nvY5Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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