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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f4a9fd33f58e513a562216668073cc7a04269fe514b04ed493541429456257' 
  AND token = '2q6jw9D9CXFvVDerhn9KeyN+ANRNJ/8/j2REztorlcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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