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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5948c8b3ca0a7aee7292e4c611cf8c5c5818556e9df8940263fcc24139c40d' 
  AND token = 'HOD6+hWG/pRGFHv57lceqf784QSVW+6vwOH3TX8cTPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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