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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095915fd6795af01ed8f344540de1b658d8bae4bebe8292ad423319c52e9cbd1' 
  AND token = 'CBJ11Hco3Ci+4Z6c+yhcTvsGHUwRRM9lJDwbjaHHs8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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