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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174cf9182fba142f0791d6945fd6d19fb9c481340f87b9887091b0ec06324a05' 
  AND token = 'IS3eQTkFPXDvky7XmV0yQxUJJvouQORwWyL3y5XBed8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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