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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a285c8d1e77c44afb6efe5ab7c3aff6cba8d0d7e2accd68cd19a69427a23f9a4' 
  AND token = 's8gcUWjpm9lh/Xd7I/kjWvL0sgRaPwClK/bwRkV+lrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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