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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020e18e8928ff4ebae52cd5308d24f64837f6ee2e94d18313cfb6919845a9168' 
  AND token = 'Qj2L242YoTExWkOlxsn/JFONI9n8iDMk5lThUoovHoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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