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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4daaafc6b46ee4bdae6040a515c5dd356a9c8c88095c4742d145c3e6895aff' 
  AND token = 'Fvdz9TDYp/kbrKf5xjvha7u6DovPaGwk07u7iHvR2LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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