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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9626795fe1ab53f3722d06dd0fca98ada02a9839465bf3e33a0af1525aedf3fd' 
  AND token = 'PQK8Hx7bo+HUOyW7daIWkViQ5o0d3FTPUW9+H5STqCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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