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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81633f7f6841cb8673e07d03f9e1925efe5b30bd0d57b0bbe11c9761d706b3f7' 
  AND token = 'G6gLFFA4PImg6Iw6vY3N3BVvdxGhNFsQPmEpRsDAvSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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