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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b9863e58f3bcc47c469a55b1edeacae39e281ecde5f44cf5f1a9fcc945d1d6' 
  AND token = '3XqSejyxpyPGMPm07IDcR3DAS2cFClDIzep1spbDeHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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