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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8960c83476ac817eb0d774d6734fb8fa430fa1a94b8eadfb7fb7181a8a36c725' 
  AND token = 'gTf0x5NfHSWJyYs6vR/Ewf5Wc2AfU5sTyjHAF+H84F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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