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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1229cc65f0a961992bd430b8ffd029415e74e3b7c8520c338c7ef45f2c6a5d7' 
  AND token = 'TUg5F1QCSghE3lzGAXU8su2XkMgQX4xcJF6el/zQwtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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