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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f678edcb1366d4dea4656eb241aaf9b7785f2b5fc4ab3c315a8d97d342beb7' 
  AND token = 'uFp6nxyRSW6ctp6/uKu/nDL0cFy43N1hPZWaz4H4J6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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