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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909fff37ba33a1e51202bf9a3c84375fa9e397693877b5cef8cf6132a55963c6' 
  AND token = 'R5nkJhY6QURH4CiUzTnA7HvQr69XSdM84oJFauzizEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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