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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82a8a90c270a8df3ef8331cee28e430e869150ac476fe97d3944fc0c6f77e74' 
  AND token = 'hgVXxiQXLtZJ2bKQcFBsrKCb2dzTi5BadQ4JQxBvCuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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