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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034605445ece55c4e36986607230e54295ff4b6d93da0d92c0d1742776b8a47e' 
  AND token = 'NNSTQ1NHAO0J7zYbkF+HvLEUL479wNlY9AZjCW/CkNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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