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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8506d3eb4ba12fd87d2be515556de8884d3e06835fd04253122fee81b75e2d33' 
  AND token = 'tLA4I1Z7C1C1z4XNHFb0Wvkj4IVjP6CPMmXDCHsVjkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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