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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2037071e7ecb2ca1a8ad034ba97f1e6f72c738b759668097f5c26e084cfa70' 
  AND token = 'uu0jd3220ASc3tzaVcWpAoymmcnrFzQhmj9purOao28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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