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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75556f18f46491b8ed714add8df2dbf0e570bf9d6dd34fe171217ac9cca3d6f' 
  AND token = 'X/C/6aSP9S58cgJ0DA6XkKb6gZg62cj+pBt9WAKfH04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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