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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4da0e3ac8d92ac9371e2bd249ed770f239adf2081928b5dedb9875cd7361e8' 
  AND token = '00xbeArHCEeYWIVl6/hE/1aHc/t9PqaM2IoC7KT0uOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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