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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860a6f09c24d7e5b1c2c6a0d004e5ea5cec970f7c5fca8ef6be8bc799e9e947b' 
  AND token = 'gy8eRqn3axsISbEaggS4+886NxAf0KAqGhaUMCteUuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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