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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5b789d1886978cededf322ca82307ba6248c095cf66c47737845cb9525f6b3' 
  AND token = 'jyNNsKLRBsYnAugHgzce46w52ajWqSZOeha6ABItRns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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