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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba324178ce13cc4eb700ec7fb9c804ba0a0848ca85efa85b6b1eb5fc029ff90' 
  AND token = '4OUaGSL2JMM9ORH666zCUggcb5U258/UKZe5hi7eSRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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