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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a78c84661fbe3cd7c8b44bdd935f155a4f60ee488c9ef791e54959e0fc564ca3' 
  AND token = 'ziyb8GR77L+TMib0kCDqjmN7OBpJF56nWU/5tlgnf/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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