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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9c96da663630b74f6c2dc5b563c92b4160f19e7f2b3d7913c52cc9a9a0aa40' 
  AND token = '//h7ZvdsogyuizZvE8RyjHknQ2icoaE2M7HrubnUh6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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