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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965beba421e549cbb4300f8559ecaf62c54aeb25b91b26132271043caaa364a0' 
  AND token = '6zjXyVLxHD78H0IyA1G3LGUeozei9coiGBplnKfqlc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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