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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd952d03e0890013f5004be9fb4f762886722ed7c6bfd6131b3e8e3653b846b65' 
  AND token = '6ErbM/EzIoh2ni+GDm/wfYySEfDhH/tvdISKqn2C6xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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