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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f134017d34ddd08e3777f96e48c92d784a74d500ecd3bcb371b821ca4acb2bb' 
  AND token = '/f5DMILEU1kydb3d5qLrdm752pIU7cVyvDypxgeT+Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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