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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600b898778890cd79e9544ef915c30547fdeef8a9ca80aba75126357f6a45202' 
  AND token = 'RYoplYLZyf5lN75OCU/wTk7xd4PEYv/xX54/5WmxjrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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